Synthesis and Spectral Characterisation of Chloro Organotin(IV) di[3(2`-hydroxyphenyl)-5-(4-substituted phenyl) Pyrazolinates]

Authors: UMESH NATH TRIPATHI, MOHAMMAD SAFI AHMAD, GORIPARTHI VENUBABU

Abstract: Chloro organotin(IV) dipyrazolinates of the type RSnCl(C_{15}H_{12}N_2OX)_2 [where C_{15}H_{12}N_2OX = 3(2'-Hydroxyphenyl)-5(4-X-phenyl)pyrazoline {where X = H (a); CH_3 (b); OCH_3 (c); Cl (d) and R = Me, Pr^n and Ph] were synthesised by the reaction of RSnCl_3 with sodium salt of pyrazolines in 1:2 molar ratio, in anhydrous benzene. These newly synthesised derivatives were characterised by elemental analysis (C, H, N, Cl and Sn), molecular weight measurement and spectral [IR and multinuclear NMR (^1H, ^{13}C and ^{119}Sn)] studies. The bidentate behaviour of the pyrazoline ligands was confirmed by IR, ^1H and ^{13}C NMR spectral data. An octahedral structure around the tin(IV) atom for RSnCl(C_{15}H_{12}N_2OX)_2 is suggested.

Keywords: Organotin(IV), pyrazolinates, Sn NMR

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